Chemical Engineering MCQs

Page No. 277

Calorific value of dry wood may be around ______________ Kcal/kg?


a5


b50


c500


d5000


View Answer 5

Combustion of pulverised coal as compared to that of lump coal ________________?


aDevelops a non-luminous flame


bDevelops a low temperature flame


cCan be done with less excess air


dProvides a lower rate of heat release



During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the _______________ of the mass?


aDensity


bPorosity


cElectrical resistivity


dNone of these


View Answer Density

Coal tar fuel – 200 (CTF 200) is a mixture of __________________?


aPitch and creosote oil


bLight oil and pitch


cAnthracene and crecosote oil


dSolar oil and pitch



Sometimes water is sprayed during coal charging in the coke oven, which helps in ________________?


aPrevention of clinker formation in the oven


bControlling the dust nuisance while charging the coal


cReducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H2 in the gas (due to the endothermic reaction represented by C + H2O = CO + H2)


dAll A., B. and C.


View Answer All A., B. and C.

The sequence of absorption in flue gas analysis by Orsat’s apparatus is respectively_______________________?


aCO2, O2, CO


bCO, O2, CO2


cCO2, CO, O2


dO2, CO2, CO


View Answer CO2, O2, CO

____________ process is meant for direct hydrogenation of coal to produce liquid fuel?


aFischer-Tropsch


bBergius


cLurgi


dNone of these


View Answer Bergius

Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________?


aCaking index


bYield of carbonised products


cFriability & oxygen content


dCalorific value



Critical Air Blast (CAB) value of coke is a direct measure of its__________________?


aReactivity


bHardness


cStrength


dNone of these


View Answer Reactivity

A particular coal is said to be free burning when it __________________?


aBurns completely


bGives smokeless burning


cShows little or no fusing action


dNone of these



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